public async Task <uint> GetNextFCntDownAsync(DevEui devEUI, string gatewayId, uint clientFCntUp, uint clientFCntDown)
{
uint newFCntDown = 0;
using (var deviceCache = new LoRaDeviceCache(this.deviceCache, devEUI, gatewayId))
{
if (await deviceCache.TryToLockAsync())
{
if (deviceCache.TryGetInfo(out var serverStateForDeviceInfo))
{
newFCntDown = ProcessExistingDeviceInfo(deviceCache, serverStateForDeviceInfo, gatewayId, clientFCntUp, clientFCntDown);
}
else
{
newFCntDown = clientFCntDown + 1;
var state = deviceCache.Initialize(clientFCntUp, newFCntDown);
}
}
}
return(newFCntDown);
}
public async Task <List <IoTHubDeviceInfo> > GetDeviceList(DevEui?devEUI, string gatewayId, DevNonce?devNonce, DevAddr?devAddr, ILogger log = null)
{
var results = new List <IoTHubDeviceInfo>();
if (devEUI is { } someDevEui)
{
var joinInfo = await TryGetJoinInfoAndValidateAsync(someDevEui, gatewayId, log);
// OTAA join
using var deviceCache = new LoRaDeviceCache(this.cacheStore, someDevEui, gatewayId);
var cacheKeyDevNonce = string.Concat(devEUI, ":", devNonce);
if (this.cacheStore.StringSet(cacheKeyDevNonce, devNonce?.ToString(), TimeSpan.FromMinutes(5), onlyIfNotExists: true))
{
var iotHubDeviceInfo = new IoTHubDeviceInfo
{
DevEUI = someDevEui,
PrimaryKey = joinInfo.PrimaryKey
};
results.Add(iotHubDeviceInfo);
if (await deviceCache.TryToLockAsync())
{
deviceCache.ClearCache(); // clear the fcnt up/down after the join
log?.LogDebug("Removed key '{key}':{gwid}", someDevEui, gatewayId);
}
else
{
log?.LogWarning("Failed to acquire lock for '{key}'", someDevEui);
}
}
else
{
log?.LogDebug("dev nonce already used. Ignore request '{key}':{gwid}", someDevEui, gatewayId);
throw new DeviceNonceUsedException();
}
}
public async Task <IActionResult> NextFCntDownInvoke(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
try
{
VersionValidator.Validate(req);
}
catch (IncompatibleVersionException ex)
{
return(new BadRequestObjectResult(ex.Message));
}
string devEUI = req.Query["DevEUI"];
string fCntDown = req.Query["FCntDown"];
string fCntUp = req.Query["FCntUp"];
string gatewayId = req.Query["GatewayId"];
string abpFcntCacheReset = req.Query["ABPFcntCacheReset"];
uint newFCntDown = 0;
EUIValidator.ValidateDevEUI(devEUI);
if (!uint.TryParse(fCntUp, out uint clientFCntUp))
{
string errorMsg = "Missing FCntUp";
throw new ArgumentException(errorMsg);
}
if (!string.IsNullOrEmpty(abpFcntCacheReset))
{
using (var deviceCache = new LoRaDeviceCache(this.deviceCache, devEUI, gatewayId))
{
if (await deviceCache.TryToLockAsync())
{
if (deviceCache.TryGetInfo(out var deviceInfo))
{
// only reset the cache if the current value is larger
// than 1 otherwise we likely reset it from another device
// and continued processing
if (deviceInfo.FCntUp > 1)
{
log.LogDebug("Resetting cache. FCntUp: {fcntup}", deviceInfo.FCntUp);
deviceCache.ClearCache();
}
}
}
}
return((ActionResult) new OkObjectResult(null));
}
// validate input parameters
if (!uint.TryParse(fCntDown, out uint clientFCntDown) ||
string.IsNullOrEmpty(gatewayId))
{
string errorMsg = "Missing FCntDown or GatewayId";
throw new ArgumentException(errorMsg);
}
newFCntDown = await this.GetNextFCntDownAsync(devEUI, gatewayId, clientFCntUp, clientFCntDown);
return((ActionResult) new OkObjectResult(newFCntDown));
}
public async Task <IActionResult> NextFCntDownInvoke(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
if (req is null)
{
throw new ArgumentNullException(nameof(req));
}
try
{
VersionValidator.Validate(req);
}
catch (IncompatibleVersionException ex)
{
return(new BadRequestObjectResult(ex.Message));
}
string rawDevEui = req.Query["DevEUI"];
var fCntDown = req.Query["FCntDown"];
var fCntUp = req.Query["FCntUp"];
var gatewayId = req.Query["GatewayId"];
var abpFcntCacheReset = req.Query["ABPFcntCacheReset"];
if (!DevEui.TryParse(rawDevEui, EuiParseOptions.ForbidInvalid, out var devEui))
{
return(new BadRequestObjectResult("Dev EUI is invalid."));
}
if (!uint.TryParse(fCntUp, out var clientFCntUp))
{
throw new ArgumentException("Missing FCntUp");
}
if (abpFcntCacheReset != StringValues.Empty)
{
using (var deviceCache = new LoRaDeviceCache(this.deviceCache, devEui, gatewayId))
{
if (await deviceCache.TryToLockAsync())
{
if (deviceCache.TryGetInfo(out var deviceInfo))
{
// only reset the cache if the current value is larger
// than 1 otherwise we likely reset it from another device
// and continued processing
if (deviceInfo.FCntUp > 1)
{
log.LogDebug("Resetting cache for device {devEUI}. FCntUp: {fcntup}", devEui, deviceInfo.FCntUp);
deviceCache.ClearCache();
}
}
}
}
return(new OkObjectResult(null));
}
// validate input parameters
if (!uint.TryParse(fCntDown, out var clientFCntDown) ||
StringValues.IsNullOrEmpty(gatewayId))
{
var errorMsg = "Missing FCntDown or GatewayId";
throw new ArgumentException(errorMsg);
}
var newFCntDown = await GetNextFCntDownAsync(devEui, gatewayId, clientFCntUp, clientFCntDown);
return(new OkObjectResult(newFCntDown));
}
public async Task <List <IoTHubDeviceInfo> > GetDeviceList(string devEUI, string gatewayId, string devNonce, string devAddr, ILogger log = null)
{
var results = new List <IoTHubDeviceInfo>();
if (devEUI != null)
{
var joinInfo = await this.TryGetJoinInfoAndValidateAsync(devEUI, gatewayId, log);
// OTAA join
using (var deviceCache = new LoRaDeviceCache(this.cacheStore, devEUI, gatewayId))
{
var cacheKeyDevNonce = string.Concat(devEUI, ":", devNonce);
var lockKeyDevNonce = string.Concat(cacheKeyDevNonce, ":joinlockdevnonce");
if (this.cacheStore.StringSet(cacheKeyDevNonce, devNonce, TimeSpan.FromMinutes(5), onlyIfNotExists: true))
{
var iotHubDeviceInfo = new IoTHubDeviceInfo
{
DevEUI = devEUI,
PrimaryKey = joinInfo.PrimaryKey
};
results.Add(iotHubDeviceInfo);
if (await deviceCache.TryToLockAsync())
{
this.cacheStore.KeyDelete(devEUI);
log?.LogDebug("Removed key '{key}':{gwid}", devEUI, gatewayId);
}
else
{
log?.LogWarning("Failed to acquire lock for '{key}'", devEUI);
}
}
else
{
log?.LogDebug("dev nonce already used. Ignore request '{key}':{gwid}", devEUI, gatewayId);
throw new DeviceNonceUsedException();
}
}
}
else if (devAddr != null)
{
// ABP or normal message
// TODO check for sql injection
devAddr = devAddr.Replace('\'', ' ');
var devAddrCache = new LoRaDevAddrCache(this.cacheStore, this.registryManager, log, gatewayId);
if (await devAddrCache.TryTakeDevAddrUpdateLock(devAddr))
{
try
{
if (devAddrCache.TryGetInfo(devAddr, out List <DevAddrCacheInfo> devAddressesInfo))
{
for (int i = 0; i < devAddressesInfo.Count; i++)
{
if (!string.IsNullOrEmpty(devAddressesInfo[i].DevEUI))
{
// device was not yet populated
if (!string.IsNullOrEmpty(devAddressesInfo[i].PrimaryKey))
{
results.Add(devAddressesInfo[i]);
}
else
{
// we need to load the primaryKey from IoTHub
// Add a lock loadPrimaryKey get lock get
devAddressesInfo[i].PrimaryKey = await this.LoadPrimaryKeyAsync(devAddressesInfo[i].DevEUI);
results.Add(devAddressesInfo[i]);
devAddrCache.StoreInfo(devAddressesInfo[i]);
}
// even if we fail to acquire the lock we wont enter in the next condition as devaddressinfo is not null
}
}
}
// if the cache results are null, we query the IoT Hub.
// if the device is not found is the cache we query, if there was something, it is probably not our device.
if (results.Count == 0 && devAddressesInfo == null)
{
if (await devAddrCache.TryTakeDevAddrUpdateLock(devAddr))
{
try
{
var query = this.registryManager.CreateQuery($"SELECT * FROM devices WHERE properties.desired.DevAddr = '{devAddr}' OR properties.reported.DevAddr ='{devAddr}'", 100);
int resultCount = 0;
while (query.HasMoreResults)
{
var page = await query.GetNextAsTwinAsync();
foreach (var twin in page)
{
if (twin.DeviceId != null)
{
var device = await this.registryManager.GetDeviceAsync(twin.DeviceId);
var iotHubDeviceInfo = new DevAddrCacheInfo
{
DevAddr = devAddr,
DevEUI = twin.DeviceId,
PrimaryKey = device.Authentication.SymmetricKey.PrimaryKey,
GatewayId = twin.GetGatewayID(),
NwkSKey = twin.GetNwkSKey(),
LastUpdatedTwins = twin.Properties.Desired.GetLastUpdated()
};
results.Add(iotHubDeviceInfo);
devAddrCache.StoreInfo((DevAddrCacheInfo)iotHubDeviceInfo);
}
resultCount++;
}
}
// todo save when not our devaddr
if (resultCount == 0)
{
devAddrCache.StoreInfo(new DevAddrCacheInfo()
{
DevAddr = devAddr,
DevEUI = string.Empty
});
}
}
finally
{
devAddrCache.ReleaseDevAddrUpdateLock(devAddr);
}
}
}
}
finally
{
devAddrCache.ReleaseDevAddrUpdateLock(devAddr);
}
}
}
else
{
throw new Exception("Missing devEUI or devAddr");
}
return(results);
}